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Abstract

A common method for correcting wavefront aberrations in an
optical system involves using an array of actuators to deform the optical
surface of a mirror until the aberrations are reduced or eliminated. Recent
interest in metallic sandwich mirrors, where the optical surface is separated
from the back surface by a lightweighted core, has created a need
for a method to correct wavefront aberrations other than by applying
actuator forces. One possible way to deform the optical surface of a sandwich
mirror is by independently pressurizing cells within the core of the
mirror. A method of active correction utilizing independent pressurized
"macrocells" in the core of an 18 in. diameter perforated aluminum honeycomb
sandwich mirror has been attempted. This paper describes the
experiments and the finite element analyses conducted on 6 in. mirror
blanks containing progressively more complex single macrocells and the
experiments conducted on two 18 in. mirror blanks, one with a cellular
honeycomb core and the other with a machined aluminum core, each
containing 19 individual macrocells. Results from the multiple macrocell
mirror blanks show that establishing a spatially variable pressure distribution
in the core of a sandwich mirror can be an effective active method
for deforming the mirror's optical surface.

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Journal of Applied Remote SensingJournal of Astronomical Telescopes Instruments and SystemsJournal of Biomedical OpticsJournal of Electronic ImagingJournal of Medical ImagingJournal of Micro/Nanolithography, MEMS, and MOEMSJournal of NanophotonicsJournal of Photonics for EnergyNeurophotonicsOptical EngineeringSPIE Reviews